{
  "id": "cond-mat/0512315",
  "version": "v2",
  "published": "2005-12-14T17:51:24.000Z",
  "updated": "2006-04-27T02:10:03.000Z",
  "title": "Signatures of a Noise-Induced Quantum Phase Transition in a Mesoscopic Metal Ring",
  "authors": [
    "Ning-Hua Tong",
    "Matthias Vojta"
  ],
  "comment": "4 pages, 4 figures, realistic parameters estimated, reference updated",
  "journal": "Phys. Rev. Lett. 97, 016802 (2006)",
  "doi": "10.1103/PhysRevLett.97.016802",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We study a mesoscopic ring with an in-line quantum dot threaded by an Aharonov-Bohm flux. Zero-point fluctuations of the electromagnetic environment capacitively coupled to the ring, with $\\omega^s$ spectral density, can suppress tunneling through the dot, resulting in a quantum phase transition from an unpolarized to a polarized phase. We show that robust signatures of such a transition can be found in the response of the persistent current in the ring to the external flux as well as to the bias between the dot and the arm. Particular attention is paid to the experimentally relevant cases of ohmic ($s=1$) and subohmic ($s=1/2$) noise.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2006-04-27T02:10:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "noise-induced quantum phase transition",
      "mesoscopic metal ring",
      "signatures",
      "in-line quantum dot",
      "relevant cases"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}